when I try to download content from the minecraft market place it downloads fine but gets stuck on the importing content screen and I cant get any content from the marketplace because of this please help.

When I try to download content from the Minecraft Marketplace it will download but gets stuck on the importing content screen and won't do anyting and even if I hit the back button it will only take me back to the previous screen and freeze then I have to close down the game and restart it in order to get it to play but I still can't use or download any content because it gets stuck on the importing content screen please help.